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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 149,156	$ 12,200
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)	39,355	39,163
Dilutive effect of other potential common shares	275	242
Weighted average common shares and potential common shares (for diluted calculation)	39,630	39,405
Net income per common share - Basic	$ 3.79	$ 0.31
Net income per common share - Diluted	$ 3.76	$ 0.31

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